Interval Training

We all know that exercise is good for us no matter what our age, but recent research done at the Mayo Clinic indicates that interval training is especially good for repairing cellular damage that worsens as we get older.  Here is a definition of interval training.
Research shows that interval training—workouts in which you alternate periods of high-intensity exercise with low-intensity recovery periods—increases fitness and burns more calories over a short period of time than steady-state cardio (you know: just doing the same thing for your whole workout time).